On the literary and scholarly awesomeness of the timezone file

John Udell's "A literary appreciation of the Olson/Zoneinfo/tz database" points out the transcendentally complex nature of keeping track of every timezone and temporary change in times that exists today or has existed in the past. I've spent hours poring over this file and have to concur with John -- it's probably the most fascinating reading on your hard-drive. What I didn't appreciate, until I finally unzipped and untarred a copy of ftp://elsie.nci.nih.gov/pub/tzdata2009o.tar.gz, is the historical scholarship scribbled in the margins of this remarkable database, or document, or hybrid of the two. You can see a glimpse of that scholarship in the above example. The most recent two rules define the latest (2007) change to US daylight savings. The spring forward rule says: "On the second Sunday in March, at 2AM, save one hour,... [read full story]                    

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